blither

/blaษชรฐษš(ษน)/

IPA: /B L AY1 TH ER0/

adjective
  1. 1

    (dated or literary) Happy, cheerful.

  2. 2

    Casually indifferent, careless, showing a lack of concern.

    โ€œShe had a blithe disregard of cultures outside the United States.โ€

verb
  1. 1

    To talk foolishly; to blather

Source: https://en.wiktionary.org/wiki/blithe, https://en.wiktionary.org/wiki/blither